Plug for walls or the like



April 9,1 35. I C ES AR 1,997,513

PLUG FOR WALLS OR THE LIKE FiledJune 1, 1954 I C. fscaf pvve Tea Patented Apr. 9, 1935 t g Q UNITED STATES PATENT OFFICE PLUG FOR, WALLS OR THE LIKE Charles Maurice Escar, Holloway, London,

England Application June 1, 1934, Serial No.'728,606 In Great Britain June 1, 1933 6 Claims. (01. 55-24) S This invention relates to plugs for attaching carborundum, emery, powdered glass, sand or the articles to walls and the like. like is then applied to the tube and allowed to Wall plugs or sockets are known which consist dry. When dry and hard, the outer surface of in a soft metal sleeve that is expanded when the tube is rough and gritty thus forming a strong inserting a holding screw, the outer surface of key between the metal and thewall 'of the hole 5 the sleeve having circular ribs, or having a polygintowhich the plug is to be inserted, thereby preonal or other non-circular section. venting any tendency to rotate during the screw- It has also been proposed in an expansible ing into the tube of the screw that attaches an metal wall plug provided with internal and exarticle to the 'wall. Alternatively the adhesive 10 ternal longitudinal ribs, to have the outer surface and the abrasive may be mixed before being ap- 10 roughened or formed with projections. plied to the tube as shown in Fig. 1. In this em- The main object of the invention is to provide bodiment this mixture b effects a roughened a wall plug that ensures a firm adherence to outer surface on the tube a. V the walls of a prepared hole and which is cheap Before applying the adhesive or the mixture to to manufacture, v

The invention consists in a wall plug comprisbe roughened, for example, by means of a file ing a soft metal tube of circular section in which or passing the same between rollers having a l a screw or bolt is adapted to be screwed therein suitably broken up surface or surfaces or the tube to expand the plug to grip the walls of a premay be roughened by any other means with the pared hole characterized in that the outside of desired result. l 30 the sleeve is covered with an abrasive material. Having now described my invention what I The invention also consists in the further feaclaim as new and desire to secure by Letters tures as claimed and described hereinafter. Patent is:-

In the drawing: a 1. A wall plug for attaching articles to a wall Fig. 1 is a perspective view, partly in section, of or the like comprising a soft metal tube of cir- 2 one embodiment of the invention. cular cross section in which a screw or bolt is Fig. 2 is a perspective view, partly in section, adapted to be screwed, the said tube having on of a second embodiment of the invention. its outer surfacean abrasive thereby permitting According to the present invention the plug is the tube when expanded by the screw to grip formed of a tube of metal, preferably lead or an the walls of the hole.

alloy of lead a as shown in the accompanying 2. A wall plug as claimed in claim 1 in which drawing, the outer diameter of which when'prethe outer surface of the tube is roughened before pared and in condition for inserting in a hole the ab asive cflvering is pp dthat has previously been made in the wall or 3. A wall pl as Claimed in Claim 1 in Which the like, can be easily driven therein. adhesive is applied to the outer surface of the The walls of the plug or tube are of a thickness tube and the abrasive appli d as a c v 011 which is slightly in excess of the depth of the said adhesive. thread of the screw which is to be inserted into i A Wa l P a claimed in claim 1 n Which the tube so that when the screw is screwed into the outer surface of the tube is roughened, an 40 thetube the screw thread will cut its way into adhesive applied to the roughened surface of the 40 the material ofthe tube there being a. little thick: tube, said abra iv e n ppl a a v r on mass allowed beyond the outer diameter of the said adhesive. 7 screw thread which will be expanded into the 5. A wall plug as claimed in claim 1 in which walls of the hole into which the tube is inserted. the abrasive is mixed with an adhesive and ap- In order to ensure a firm adherence of the tube plied a a Covering Said tube- 45 a to the wall of the prepared hole, the outside 6. A wall plug as claimed in claim 1 in which surface of the tube in the embodiment illustrated the outer surface of said tube is roughened, and in Fig. 2 is coated with an adhesive 0 such as an adhesive mixed with said abrasive and applied glue, paste, resin, rubber or cellulose solution or as a covering to said roughened surface. the like. An abrasive material I), for example, CHAR ES MAURICE SCARE. 50

the outer surface of the plug, the surface may .15 

